Well Known Port Numbers

80 - Hypertext Transfer Protocol (HTTP)
21 - File Transfer Protocol (FTP)
23 - Telnet protocol - unencrypted text communications
25 - Simple Main Transfer Protocol (SMTP)
109 - Post Office Protocol v2 (POP2)
110 - Post Office Protocol v3 (POP3)
115 - Simple File Transfer Protocol (SFTP)
143 - Internet Message Access Protocol (IMAP)
443 - Hypertext Transfer Protocol over SSL/TLS (HTTPS)
992 - TELNET protocol over TLS/SSL
993 - Internet Message Access Protocol over SSL (IMAPS)
995 - Post Office Protocol 3 over TLS/SSL (POP3S)
1433 - MSSQL Server
1801 - Microsoft Message Queuing